#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main() {
    int a;
    while (scanf("%d", &a) != EOF)
    {
        for (int i = 0; i < a; i++)
        {
            for (int j = 0; j < a; j++)
            {
                if (i == 0 || i == a - 1)
                {
                    printf("* ");
                }
                else {
                    if (j == 0 || j == a - 1)
                    {
                        printf("* ");
                    }
                    else
                    {
                        printf("  ");
                    }
                }
            }
            printf("\n");
        }
    }
    return 0;
}